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首页> 外文会议>Yohkoh 10th Anniversary Meeting on Multi-Wavelength Observations of Coronal Structure and Dynamics Jan 20-24, 2002 Kona, Hawaii, USA >INTENSITY DYNAMICS OF AN 'EIT WAVE' OBSERVED BY TRACE
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INTENSITY DYNAMICS OF AN 'EIT WAVE' OBSERVED BY TRACE

机译：跟踪观察到的“ Eit Wave”的强度动力学

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摘要

On 13 June 1998 an "EIT wave" was observed by the TRACE satellite, initiated by a flare outside the TRACE field of view. This allowed for deep exposure observations, something rare with "EIT waves". To study the wave dynamics we examine a time series of base difference images, taking slices radiating from the flare origin. Graphs of the slices show changes in intensity with respect to a pre-flare image. We find the "EIT wave" is observable as a propagating crest for 400-500 seconds before it dissipates and/or is disrupted by in-situ magnetic structures. We examine eight vectors that can be modelled in part by Gaussian curves. Velocities determined by measuring from peak intensities (the "center" of the wave rather than a visually determined wave front) give a wide range of values; the eastern portion of the wave front moves coherently at ～ 350 km/s, while the western wave front slows dramatically and shows possible deflection. One of the slices appears to map ejecta, rather than a wave front trajectory. Initial results show that the "EIT wave" crests do not exhibit a monotonic dissipation, but instead seem to maintain or increase in size for hundreds of seconds before dimming and broadening. Similarly, the depleted region following each crest also becomes larger over time. The intensity increase may represent material heating into the TRACE 195 A passband, or it may be evidence of a soliton behavior. The large intensity decrease behind the wave front appears to be the coronal dimming often associated with coronal mass ejections.
机译：1998年6月13日，TRACE卫星观测到“ EIT波”，这是由TRACE视场外的耀斑引起的。这样就可以进行深度曝光观察，这在“ EIT波”中很少见。为了研究波浪动力学，我们检查了一系列基本差图像，并从耀斑起源处辐射了下来。切片图显示了相对于耀斑前图像的强度变化。我们发现“ EIT波”作为传播波峰可以观察到400-500秒，然后消散和/或被原位磁性结构破坏。我们研究了可以由高斯曲线部分建模的八个向量。通过测量峰值强度（波的“中心”而不是目视确定的波阵面）确定的速度给出了宽范围的值；波前的东部以〜350 km / s的速度连贯地运动，而西波前则急剧减慢并显示出可能的偏转。切片之一似乎映射了喷射，而不是波前轨迹。初步结果表明，“ EIT波”波峰没有表现出单调的耗散，而是在变暗和变宽之前似乎保持或增加了数百秒的大小。类似地，每个波峰之后的耗尽区也会随着时间而变大。强度增加可能表示材料被加热到TRACE 195 A通带中，或者可能是孤子行为的证据。波前后面的大强度下降似乎是经常与日冕物质抛射有关的日冕变暗。

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